The element with highest first ionisation energy

Which of the following would replace @ and & respectively in the following expression such that ‘O > A’ is definitely true?

Statements: P > Q = R ≤ S; R > T > U; U = Z ≥ O

Conclusions:

I. P > U

II. O < S

III. R > P

Statements: A < B ≤ C > E; F = I ≤ B > G; J > K = G < D

Conclusions:

I. C ≥ F

II. E < I

III. D > C

What should come in the place of question mark, in the given expressions to make ‘J < E’ always true?

‘D < E _? _F = G ≥ H = I ≥ J’

Statements: E < S = F < G, H < A ≥ F ≤ B

Conclusion:

I. B > E

II. H ≤ G 

Given statement shows the relation between different elements followed by two conclusions. 

Statement: B2 = T4 < E3 ≤ G5 > F6 = H7 > Q8 

Statement: Q > P; R > S > O; R < P

Conclusion:

I.Q > O

II. Q > S

Statements: O > M = Q > S; M ≥ K > A; Q ≤ O < E